#include <bits/stdc++.h>
using namespace std;

long long gcd(long long x, long long y)
{
    if (y == 0)
        return x;
    return gcd(y, x % y);
}

long long lcm(long long x, long long y)
{
    if (x == 0 || y == 0)
        return 0;
    return x / gcd(x, y) * y;
}

int main()
{
    string n;
    cin >> n;
    int cnt = 1;
    for (int i = 0; i < n.size(); i++)
    {
        // if (n[i] == '1' or n[i] == '2' or n[i] == '3' or n[i] == '5' or n[i] == '7')
        if (n[i] == '0' or n[i] == '4' or n[i] == '6' or n[i] == '9')
            cnt++;
        else if (n[i] == '8')
            cnt += 2;
    }
    cout << min(n.size() * 2 + cnt, n.size() + cnt * 2) << endl;
}